P0879 — Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent

What Does P0879 Mean?

P0879 is a diagnostic trouble code indicating: Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0879

⚠️ Check Engine Light (MIL) illuminated
⚠️ Transmission Fluid Pressure Sensor/Switch D signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Harsh or delayed shifting

Common Causes

🔍 Loose or intermittent connection at Transmission Fluid Pressure Sensor/Switch D
🔍 Wire chafing causing intermittent contact
🔍 Transmission Fluid Pressure Sensor/Switch D failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P0879 mean?

P0879 indicates: Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent. The vehicle's computer has detected that the Transmission Fluid Pressure Sensor/Switch D is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0879?

Only short distances if absolutely necessary. P0879 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P0879?

Repair costs for P0879 typically range from $30 to $500, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and reseat all Transmission Fluid Pressure Sensor/Switch D connectors
🔧 Repair chafed or damaged wiring in Transmission Fluid Pressure Sensor/Switch D circuit
🔧 Replace Transmission Fluid Pressure Sensor/Switch D if failing intermittently

1
Find your vehicle above
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0879: Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent